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• Linear regression with correlated data

  I started following the debate on differential minimum wage for youth (15-19 year old) and adults in New Zealand. Eric…
  6 Oct, '11

• R pitfall #1: check data structure

  A common problem when running a simple (or not so simple) analysis is forgetting that the levels of a factor…
  5 Oct, '11

• All combinations of levels for two factors

  There are circumstances when one wants to generate all possible combinations of levels for two factors. For example, factor one…
  4 Oct, '11

• “Not in” in R

  When processing data it is common to test if an observation belongs to a set. Let’s suppose that we want…
  4 Oct, '11

• A shoebox for data analysis

  Recidivism. That’s my situation concerning this posting flotsam in/on/to the ether. I’ve tried before and, often, will change priorities after…
  4 Oct, '11

• Python code to simulate the Monty Hall problem

  I always struggled to understand the Monty Hall Problem, which popped up again in William Briggs’s site. The program assumes…
  24 Apr, '11

• Cicadas

  These last two weeks the soundscape has been invaded by cicadas, sometimes deafening, sometimes slightly highlighting the silence. I am…
  27 Jan, '11

• Publon: my simple publication Python script

  After using PmWiki (PHP wiki software) for nearly five years to maintain my web site I was a bit tired…
  21 May, '10

• Dynamic Google maps using Python

  I originally wrote this code on 2 February 2009, as a quick hack to publish air pollution in Santiago. The…
  20 Apr, '10

• Preamble to the instructions on how to wind a watch

  皿 Think of this: when they present you with a watch, they are gifting you with a tiny flowering hell, a…
  7 Apr, '10